Archaeomagnetic dating is the study and interpretation of the signatures of the Earth's magnetic field at past times recorded in archaeological materials. These paleomagnetic signatures are fixed when ferromagnetic materials such as magnetite cool below the Curie pointfreezing the magnetic moment of the material in the direction of the local magnetic field at that time. The direction and magnitude of the magnetic field of the Earth at a particular location varies with timeand can be used to constrain the age of materials.
In conjunction with techniques such as radiometric datingthe technique can be used to construct and calibrate the geomagnetic
Archaeomagnetic dating definition nsa time scale. This is one of the dating methodologies used for sites within the last 10, years. Thellier in the s  and the increased sensitivity of SQUID magnetometers has greatly promoted its use.
The Earth's magnetic field has two main components. Within these weaker areas the local directions and intensities change gradually secular variation. A compass does not point to the true North Pole but to direction that is a function of the North Magnetic Pole and the local secular variation to yield a magnetic declination.
The magnetic declination at any given time can be frozen into a clay formation that contains magnetite and is heated above the Curie point. In general, many cultures used "Archaeomagnetic dating definition nsa" fire hearths made of clay bricks, or a space lined with clay, that were baked into place by use.
These artifacts of occupation can yield the magnetic declination from the last time they were fired or used. Magnetic Domains to Geologic Terranes.
Archaeomagnetic dating requires an undisturbed feature that has a high likelihood of containing a remnant magnetic moment from the last time it had passed through the Curie point.
This involves sufficient mass to take samples from, and a suitable material with adequate magnetite to hold the remnant magnetism. In addition, the feature needs to be in an area for which a secular variation curve SVC exists.
Once the paleodirections
Archaeomagnetic dating definition nsa enough independently dated archaeological features are determined, they can be used to compile a secular variation record for a particular region, known as an SVC. The Archaeomagnetic Laboratory at the Illinois State Museum has secular variation curves for the southwest, mid-continent and southeast United States.
Additional data points from archaeomagnetic samples with corresponding dating techniques such as tree ring dating or carbon dates, help refine the regional curves.
A number of samples are removed from the feature by encasement in non-magnetic plaster within non-magnetic moulds. These samples are marked for true north at the time of collection. The samples are sent to an Archaeomagnetic Laboratory for processing.
Each of the samples is measured in a spinner magnetometer to determine the thermal remanent magnetism of each sample. The results are statistically processed and an eigenvector is generated that shows the three-dimensional magnetic declination that will yield a location for the North Pole at the time the last thermal event of the feature.
Data from this feature is compared to the regional secular variation curve in order to determine the best-fit date range for the feature's last firing event. From Wikipedia, the free encyclopedia. The University of Arizona Press. Archived from the original on Canon of Kings Lists of kings "Archaeomagnetic dating definition nsa." Chinese Japanese Korean Vietnamese.
Lunisolar Solar Lunar Astronomical year numbering. Deep time Geological history of Earth Geological time units. Chronostratigraphy Geochronology Isotope geochemistry Law of superposition Luminescence dating Samarium—neodymium dating. Amino acid racemisation Archaeomagnetic dating Dendrochronology Ice core Incremental dating Lichenometry Paleomagnetism Radiometric dating Radiocarbon Uranium—lead Potassium—argon Tephrochronology Luminescence dating Thermoluminescence dating.
Concepts Deep time Geological history of Earth Geological time units. Absolute dating Amino acid racemisation Archaeomagnetic dating Dendrochronology Ice core Incremental dating Lichenometry Paleomagnetism Radiometric dating Radiocarbon Uranium—lead Potassium—argon Tephrochronology Luminescence dating Thermoluminescence dating. Figure Examples of palaeomagnetic dating results on lavas from the TgVC.
. archaeomagnetic datasets are restricted to times of human settlement, which in Nsi/Nsa/Nsp are the number of sites averaged over/number of samples. Have been investigated using archaeomagnetic techniques.
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